JP2005076866A - Process for manufacturing movable flange of pulley for continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a process for manufacturing a variable flange of a continuously variable transmission which can provide good workability in spinning process and impart sufficient hardness by carburizing and quenching process. <P>SOLUTION: A steel material comprising 0.15 to 0.20% by weight of carbon, 0.35 to 0.81% by weight of manganese, 0.05 to 0.15% by weight of silicon, less than 0.015% by weight of phosphorus, less than 0.02% by weight of sulfur and 0.03 to 0.2% by weight of titanium in which the balance is iron, is subjected to hot forging to form a flange material 21 comprising an axis hole 8a and a disk like body 9 provided with a flange face 9a and a preform part 22 for forming a cylinder part 10. A carburization preventive agent 23 is applied to the preform part 22. The flange material 21 is subjected to carburizing and quenching process. The carburization preventive agent 23 is removed from the flange material 21, and the preform part 22 is subjected to spinning process to form a cylinder part 10. The steel material contains 0.001 to 0.002% by weight of boron. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a movable flange constituting a pulley used in a continuously variable transmission such as an automobile.

  As shown in FIG. 1, a continuously variable transmission 1 such as an automobile is known which includes a driving pulley 2, a driven pulley 3, and an endless metal belt 4 wound between pulleys 2 and 3. ing.

  The movable flange 7 of the driving pulley 2 includes a shaft hole 8a through which the rotary shaft 5 is inserted, and a disk-shaped body 9 extending in the outer peripheral direction of the shaft hole 8a. The movable flange 7 is immovable with the flange surface 9a of the disk-shaped body 9. An endless metal belt 4 is disposed between the flange 6 and the flange surface 6a. The movable flange 7 includes a cylinder portion 10 provided integrally with the disk-like body 9 on the side opposite to the flange surface 9a. The cylinder portion 10 is slidably accommodated in a cylindrical partition wall 11 and is pressurized. A chamber 12 is formed. As a result, the disc-like body 9 can reciprocate along the axial direction of the rotary shaft 5 by pressure such as hydraulic pressure applied to the pressure chamber 12.

  In the continuously variable transmission 1, by changing the pressure applied to the pressure chamber 12, the disk-shaped body 9 is moved along the axial direction of the rotary shaft 5, and the interval between the flange surfaces 9a and 6a is changed, Change the gear ratio steplessly. At this time, the endless metal belt 4 slides along the flange surfaces 9a and 6a. Therefore, at the movable flange 7, at least the surface hardness of the flange surface 9a needs to be increased. Therefore, the surface hardness of the flange surface 9a is usually increased by carburizing and quenching the movable flange 7.

  Incidentally, in the movable flange 7, the cylinder portion 10 can also be formed by fitting a separately manufactured cylindrical member to the outer peripheral edge of the movable flange 7. However, if it does in this way, the fitting part of the said cylindrical member and the movable flange 7 must be thickened, and a weight increase cannot be avoided. Further, in order to combine the cylindrical member and the movable flange 7, it is necessary to process both with high accuracy, and an increase in manufacturing cost is inevitable.

  Therefore, conventionally, a technique for forming the cylinder portion 10 integrally with the movable flange 7 has been proposed. As the technique, for example, a steel material is first hot forged to form a movable flange material having an outline of the movable flange 7 and an annular preliminary shape portion for forming the cylinder portion 10 on the outer peripheral edge. Then, after the carburizing quenching is performed on the movable flange material to increase the hardness, a technique for forming the cylinder portion 10 by spinning the preliminary shape portion into a cylindrical shape is known (see, for example, Patent Document 1). ). Since the spinning process is a cold process, it is desirable that the steel material forming the movable flange material has a low carbon content in order to improve workability.

However, when the carbon content of the steel material is low, there is a disadvantage that even if the carburizing and quenching treatment is performed, the carbon amount is insufficient and sufficient hardness may not be imparted to the surface of the flange surface 9a. .
JP 2000-310305 A

  The present invention eliminates such inconveniences, can provide good workability in spinning, and can provide sufficient hardness by carburizing and quenching, and a method for manufacturing a movable flange of a pulley for continuously variable transmission The purpose is to provide.

  To achieve this object, the present invention provides a shaft hole through which a rotating shaft is inserted, a disk-like body extending in the outer peripheral direction of the shaft hole and having a flange surface formed on one surface thereof, and the disk A continuously variable transmission provided with a cylinder portion that is provided integrally with the disc-like body on the opposite side of the flange surface of the rod-like body and forms a pressure chamber that allows the disc-like body to reciprocate in the axial direction of the rotating shaft. In the manufacturing method of the movable flange of the machine pulley, carbon 0.15-0.20 wt%, manganese 0.35-0.81 wt%, silicon 0.05-0.15 wt%, phosphorus 0.015 wt% Less than, less than 0.02% by weight of sulfur, 0.03 to 0.2% by weight of titanium, and by hot forging a steel material having a composition in which the balance is iron, the shaft hole, the flange surface, A disk having a disk-shaped body provided with a preliminary shape portion for forming the cylinder portion. Forming a die material, applying a carburizing agent to the preliminary shape portion of the flange material, subjecting the flange material coated with the carburizing agent to carburizing and quenching, and carburizing and quenching treatment. And a step of forming the cylinder portion by spinning the preliminary shape portion after removing the anti-carburizing agent from the flange material subjected to.

  According to the present invention, since the carburizing and quenching treatment is performed on the flange material obtained by hot forging the steel material having the above composition, sufficient hardness can be imparted to the flange surface. Moreover, since the said raw material retains the said composition about the preliminary | backup shape part by apply | coating a carburizing agent to the said preliminary | backup shape part in the case of the said carburizing and quenching process, since the said composition is hold | maintained, it is more favorable by the said spinning process. Workability is obtained, and the cylinder part can be easily formed.

  If the steel content is less than 0.15% by weight, the steel material cannot obtain a desired hardness, and if it exceeds 0.20% by weight, the steel material tends to crack during spinning. Further, if the manganese content is less than 0.35% by weight, sufficient hardness cannot be obtained by carburizing and quenching treatment, and if it exceeds 0.81% by weight, inclusions such as MnS are formed and cracked during spinning. It becomes easy. Further, if the silicon content is less than 0.05% by weight, the effect of strengthening the ferrite phase and increasing the tempering resistance may not be obtained. If the silicon content exceeds 0.15% by weight, inclusions such as SiS may be obtained. And easily breaks during spinning. On the other hand, if the phosphorus content exceeds 0.015% by weight, it combines with manganese or the like to form inclusions, which are easily broken during spinning. On the other hand, when the sulfur content exceeds 0.02% by weight, it combines with manganese, silicon and the like to form inclusions, and is liable to break during spinning. Further, if the titanium content is less than 0.03% by weight, the effect of refining the crystal grains may not be obtained, and if it exceeds 0.2% by weight, inclusions such as TiN are formed and cracks easily occur.

Further, the steel material contains 0.001 to 0.002% by weight of boron. When the boron content is less than 0.001% by weight, the effect of refining crystal grains may not be obtained. When the content exceeds 0.002% by weight, inclusions such as Fe ₂ B are likely to be generated. It becomes easy to break.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory cross-sectional view showing a configuration example of a continuously variable transmission, and FIG. 2 is an explanatory cross-sectional view showing a method for manufacturing a movable flange of the present embodiment.

  A continuously variable transmission 1 such as an automobile includes a driving pulley 2 and a driven pulley 3, and an endless metal belt 4 is wound between the pulleys 2 and 3 as shown in FIG.

  The driving pulley 2 includes a stationary flange 6 fixed to the rotating shaft 5 and a movable flange 7 that can reciprocate along the axial direction of the rotating shaft 5. The movable flange 7 includes a cylindrical sliding member 8 and a shaft hole 8a through which the rotating shaft 5 is inserted. The sliding member 8 is attached to the rotating shaft 5 through the shaft hole 8a and the axial direction of the rotating shaft 5 is fixed. And reciprocating along the rotation axis 5 and rotating together with the rotary shaft 5.

  The movable flange 7 includes a disk-like body 9 extending in the outer peripheral direction of the shaft hole 8 a at the end of the shaft hole 8 a on the side of the stationary flange 6, and the disk-like body 9 is inclined to a surface facing the stationary flange 6. A flange surface 9a is provided. And the endless metal belt 4 is arrange | positioned between the flange surface 9a and the inclined flange surface 6a with which the surface which the stationary flange 6 opposes was provided.

  The movable flange 7 includes a cylindrical cylinder portion 10 provided integrally with the disk-shaped body 9 along the outer peripheral edge of the disk-shaped body 9 on the side opposite to the flange surface 9a. The cylinder portion 10 is slidably accommodated in a cylindrical partition wall 11 attached to the bearing portion 5 a of the rotating shaft 5, and a pressure chamber 12 is formed by the cylinder portion 10 and the partition wall 11. As a result, the disc-like body 9 can reciprocate along the axial direction of the rotary shaft 5 by pressure such as hydraulic pressure applied to the pressure chamber 12.

  On the other hand, the driven pulley 3 includes a stationary flange 14 fixed to the rotating shaft 13 and a movable flange 15 that can reciprocate along the axial direction of the rotating shaft 13. The movable flange 15 includes a cylindrical sliding member 16 and a shaft hole 16a through which the rotation shaft 13 is inserted. The sliding member 16 is attached to the rotation shaft 13 through the shaft hole 16a, and the axial direction of the rotation shaft 13 is reached. And reciprocating along the rotation axis 13 and rotating together with the rotary shaft 13. The flanges 14 and 15 are provided with inclined flange surfaces 14a and 15a on opposite surfaces, and the endless metal belt 4 is disposed between the flange surfaces 14a and 15a. The movable flange 15 of the driven pulley 3 is urged by the coil spring 17 or the like and is pressed toward the stationary flange 14.

  In the continuously variable transmission 1 having the above-described configuration, when changing the gear ratio, the movable flange 7 is moved along the axial direction of the rotary shaft 5 by changing the pressure applied to the pressure chamber 12. If it does in this way, the space | interval of the flange surfaces 9a and 6a of the drive side pulley 2 will be changed, and in connection with this, the winding position of the endless metal belt 4 will be the diameter of the drive side pulley 2 along the flange surfaces 9a and 6a. Move in direction. In the driven pulley 3, the interval between the flange surfaces 14 a and 15 a is changed in accordance with the change in the interval between the flange surfaces 9 a and 6 a of the drive pulley 2, and the winding position of the endless metal belt 4 is set to the flange surface 14 a. , 15a along the diameter direction of the driven pulley 3. As a result, in the continuously variable transmission 1, the gear ratio can be changed continuously.

  Next, with reference to FIG. 2, the manufacturing method of the movable flange of this embodiment is demonstrated. The manufacturing method of this embodiment manufactures the movable flange 7 of the driving pulley 2.

前記組成と、炭素当量とを備える鋼材料として、例えば、山陽特殊製鋼株式会社製ＴＭＡＸＪ１Ｂ（商品名）、ＴＭＡＸＪ２Ｂ（商品名）、大同特殊鋼株式会社製ＡＬＦＡ鋼（商品名）、Ｓｕｐｅｒ−ＡＬＦＡ鋼（商品名）等を挙げることができる。 In the manufacturing method of this embodiment, first, the flange raw material 21 shown to Fig.2 (a) is formed by hot forging steel material. The steel material is carbon 0.15-0.20 wt%, manganese 0.35-0.81 wt%, silicon 0.05-0.15 wt%, phosphorus less than 0.015 wt%, sulfur 0.02 It contains less than wt%, titanium 0.03-0.2 wt%, boron 0.001-0.002 wt%, the balance is iron, and the carbon equivalent is in the range of 0.44 to 0.54. The carbon equivalent is a numerical value calculated by the following formula.

Examples of steel materials having the above composition and carbon equivalent include TMAXJ1B (trade name), TMAXJ2B (trade name) manufactured by Sanyo Special Steel Co., Ltd., ALFA steel (trade name) manufactured by Daido Special Steel Co., Ltd., and Super-ALFA steel. (Product name) and the like.

  The flange material 21 is formed in a general shape of the movable flange 7 and includes a shaft hole 8a formed in the sliding member 8 and a disk-like body 9 extending in the outer peripheral direction of the shaft hole 8a. The disc-like body 9 is integrally provided along the outer peripheral edge on the inclined flange surface 9a provided on the end portion of the shaft hole 8a and formed on the surface on the end portion side, and on the surface opposite to the flange surface 9a. And a pre-shaped portion 22 for forming the cylinder portion 10 provided.

  Next, as shown in FIG. 2B, a carburizing agent 23 is applied to the surface of the preliminary shape portion 22. And the flange raw material 21 with which the preliminary | backup shape part 22 was coat | covered with the carburizing agent 23 is accommodated in the carburizing furnace which is not shown in figure, and a carburizing quenching process is performed. A commercially available product can be used as the carbon-proofing agent and is not particularly limited.

  Since the flange material 21 is formed from a steel material having the composition and the carbon equivalent, the carbon content of the surface is increased in the portion other than the portion covered with the carburizing agent 23 by the carburizing and quenching process. , Hardness increases. On the other hand, in the preliminary shape part 22 covered with the carburizing agent 23, the original composition of the steel material is maintained.

  Therefore, when the carburizing and quenching process is completed, the carburizing agent 23 covering the surface of the preliminary shape portion 22 is removed. And as shown in FIG.2 (c), the movable flange 7 provided with the cylindrical cylinder part 10 is formed by spinning the preliminary | backup shape part 22 (it shows with a virtual line).

  The spinning process is a cold process, but the preliminary shape portion 22 is not subjected to carburizing and quenching as described above, and the original composition of the steel material is maintained. Therefore, the flange material 21 can easily form the cylinder portion 10 without causing a crack or the like by the spinning process.

Explanatory sectional drawing which shows the example of 1 structure of a continuously variable transmission. Explanatory sectional drawing which shows the manufacturing method of the movable flange of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 5 ... Rotary shaft, 8a ... Shaft hole, 9 ... Disc-shaped body, 9a ... Flange surface, 7 ... Movable flange, 10 ... Cylinder part, 12 ... Pressure chamber, 21 ... Flange material, 22 ... Preliminary shape part, 23 ... Prevention Charcoal.

Claims (2)

A shaft hole through which the rotation shaft is inserted, a disk-like body extending in the outer circumferential direction of the shaft hole and having a flange surface formed on one surface thereof, and the disk on the opposite side of the disk-like body from the flange surface In a method of manufacturing a movable flange of a pulley for a continuously variable transmission, comprising a cylinder portion that is provided integrally with a cylindrical body and forms a pressure chamber that allows the disk-shaped body to reciprocate in the axial direction of the rotary shaft.
Carbon 0.15-0.20 wt%, manganese 0.35-0.81 wt%, silicon 0.05-0.15 wt%, phosphorus less than 0.015 wt%, sulfur less than 0.02 wt%, titanium A pre-shaped portion for forming the shaft hole, the flange surface and the cylinder portion by hot forging a steel material having a composition containing 0.03 to 0.2% by weight and the balance being iron. Forming a flange material comprising a disk-like body comprising:
Applying a carburizing agent to the preliminary shape portion of the flange material;
A step of carburizing and quenching the flange material coated with the carburizing agent;
A continuously variable transmission comprising: removing the carburizing agent from the flange material that has been subjected to the carburizing and quenching treatment, and then spinning the preliminary shape portion to form the cylinder portion. Of manufacturing a movable flange of a pulley for an automobile. The method for manufacturing a movable flange of a pulley for a continuously variable transmission according to claim 1, wherein the steel material contains 0.001 to 0.002% by weight of boron.

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